Baxi DUO-TEC COMPACT - TROUBLESHOOTING SERVICE FAULTS; Fault Code Identification and Actions

7710400 (01-06/18) 16
INSTALLER Section (en)
15. TROUBLESHOOTING SERVICE FAULTS
The faults shown on the display are identied with the symbol and a number (fault code). For a complete list of faults, see the
following table.
If appears on the display the fault must be RESET by the user.
To RESET the boiler, press and hold down for 2 seconds. If faults are displayed frequently, call the Authorised Service Centre.
Description of fault Service action
10
External probe sensor faulty Check the sensor (*).
12
Hydraulic differential pressure switch switching failure Check correct operation of the pressure switch and the wiring.
13
Hydraulic differential pressure switch contacts stuck See the actions indicated in E12
15
Gas valve control error
Check the connections between the gas valve and the
electronic board. If necessary, replace the electronic board.
18
Hydraulic circuit automatic lling in progress Wait for the end of the lling cycle.
19
Fault in system lling phase Check the lling tap.
20
NTC ow sensor faulty
Check the sensor (**).
Check the continuity of the probe wiring.
Make sure the wiring has not shorted.
28
NTC fumes sensor faulty
Check the fumes NTC probe (***).
Check the continuity of the probe wiring.
Make sure the wiring has not shorted.
40
NTC return sensor faulty See the actions indicated in E20
50
NTC domestic hot water sensor faulty See the actions indicated in E20
53
Fumes outlet obstructed
Check that the drainage pipe is free from obstructions.
Switch off the electric power supply to the boiler for a few
seconds.
55
Electronic board not calibrated
Activate the automatic calibration function described in the
spare parts instructions sheet.
83…87
Communication problem between boiler board and control unit.
Probable short circuit on wiring.
Check the wiring between the Ambient Unit and the electronic
board or RF link.
92
Fumes fault during calibration (probable fumes recirculation)
Check for any recirculation of fumes.
Activate the automatic calibration function described in
the paragraph YEARLY MAINTENANCE – REPLACING
COMPONENTS.
109
Air in boiler circuit (temporary fault)
Check pump operation (unscrew the front cap and release the
pump impeller with a screwdriver).
Check the pump power input wiring.
110
Safety thermostat tripped due to overtemperature (pump
probably blocked or air in heating circuit).
Check pump operation (unscrew the front cap and release the
pump impeller with a screwdriver).
Check the pump power input wiring
Check that the limit thermostat is undamaged and replace it if
necessary
Check the continuity of the limit thermostat wiring
117
Pressure in hydraulic circuit too high (> 2.7 bar)
Check that the pressure in the system is correct
See the FILLING THE SYSTEM section.
118
Pressure in hydraulic circuit too low
If the pressure in the CH circuit is < 0.5 bar, perform lling (see
the FILLING THE SYSTEM section).
Check the hydraulic pressure switch works correctly
125
No circulation safety trip.
(control performed via a temperature sensor)
See the actions indicated in E109
128
No ame
Check the ame sensing electrode is in good condition
and correctly positioned (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
Check the wire is uninterrupted and makes good contact with
the ame sensing electrode and the ignition switch.
See the actions indicated in E92
129
Loss of ame at ignition
Check the ame sensing electrode is in good condition
and correctly positioned (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
Check the wire is uninterrupted and makes good contact with
the ame sensing electrode and the ignition switch.
Check for any recirculation of fumes.
130
Fumes NTC tripped due to overtemperature
Check the heat exchange level of the water-fumes exchanger:
possible insufcient circulation or presence of scale.
Check the fumes NTC probe (***).